rimist 0 Posted June 2, 2009 I have a dvr with an AVTECH 760M V06A mainboard dated 2006/12/20 and a 760P V05A daughterboard dated 2006/11/15. I do not have a hdd installed. It has been working for several months. This afternoon we had a very brief power outage (light switch toggled), which reset all the connected electronics (tv, cable, dvr, etc). Everything else booted back up normally. The dvr rebooted, displaying "system init 1" and then continued to reboot every couple minutes. I have already attempted to do a hard reset, as well as remove the hdd cable (no hdd installed so why keep it in), removed the fan I had added, but there is no change. I would appreciate any help I can get. Share this post Link to post Share on other sites
scorpion 0 Posted June 2, 2009 The hard drive is bad...oh....no hard drive.....hmmmm... you got me! I would have you test the power supply (760P P=powerboard ) for proper voltage. Try a computer store as they should be familiar with the values that run the chipsets. If someone tells you the power board is $80, or $100 then do not be surprised. I do not belive you will find it cheaper than $50.00. If you do then do not buy it as buyer beware. Share this post Link to post Share on other sites
rimist 0 Posted June 2, 2009 scorpion - Thanks for the quick reply. I noticed somewhere else in the forum that the board puts out 3.3 / 5 / 12 v just like a pc power supply, which got me thinking... Do you happen to know the pinout spec on the connection between the mother & daughter boards? I am considering purchasing a small pc power supply and creating an adapter for the atx motherboard connector to replace the daughterboard, and would also have enough juice to run two hard drives and a system fan. I just don't see the point in spending 80 to 100 on a daughter board that is so touchy, when I can get a more powerful & stable solution for the same amount (or perhaps less) Share this post Link to post Share on other sites
scorpion 0 Posted June 2, 2009 I do not think a power supply would cause it to reboot. With a hard drive installed then it would make sense. The lack of voltage would just make the DVR inoperable. You have more of a "watchdog" circuit being triggered, and I do not know why. It is not the lack of quality of the board, but more the electrical experience that you described. I will have to assume that you do not have a line conditioner on the DVR, and that is subjecting the DVR to everything coming down the socket. If you feel that you need to replace the power supply with something different then this tells me that you are running more than two hard drives, and you have some serious add on fans that draw some extreme amp values. I do not have a pinout of the board but you can test for the voltages with a meter. If the power supply was below standard as you describe then I think you would see every other post would be someone asking to source the boards. Looking in the past of old threads you are not going to find very many posts about the power supply compared to "how do you network this thing"? Share this post Link to post Share on other sites
rimist 0 Posted June 2, 2009 I was basing my idea of upgrading the power supply on your suggestion of the power board possibly being bad (agreed it needs to be tested to confirm this) The only thing I had connected was a fan that drew 0.08A. The two hard drives idea was for the future. I was basing the concept that the power board was barely adequate on posts (here and other places) that comment on frying the board by connecting a fan to it, and trying to find a fan with a very small draw. The system is plugged in to a surge protector that "reduces noise interference, absorbs surges, and provides common and normal mode protection from high energy spikes" No, it isn't a battery back up, but I didn't think I needed to put it on a back up until I got a hard drive installed. I am not saying that the daughter board is sub standard in general, but others have had some issue with it, and I was thinking that I just happened to get one that was having troubles (again, not confirmed). I do have to say that nothing else that I have connected that has been experiencing the same electrical conditions for a longer time (everything else is older, either months or years) has had a problem. (That I know of) From here I will test the actual voltages the daughter board is producing and post them, so perhaps we can determine if it is actually the problem or if it is something else. Share this post Link to post Share on other sites
scorpion 0 Posted June 2, 2009 What you are saying make sense. You do not need this speech, but others reading this post may need this info. It is hard to read in to the post that members provide. There are some posts where the responding member may feel that the original poster is more of a DIY, and trying to do something that they are not "qualified" to do. It could be a "I am greater than you" mentality as well on the responder. I do not think this is the case as everyone who responds to the posts are pretty level headed on the forum. We have had a few "hotheads" but they tend to move on when they feel the community is not "bowing down to them". It could be that a responding poster realizes that the DIY is in over their head, and really needs to stop, and evaluate what they are doing. There are color codes, and values that need to be used when selecting parts. You know what you are doing so I would say feel free to do so. I do not know if there are feed back circuits on the power supply board. I do not know what would happen if you took the board off completely, and subbed another power supply. Most times when someone adds a fan they just add a power supply for the fan leaving the original power supply in place. With the correct AVTech DVR model you will have a connector that allows you to attach a device allowing you to stack as many hard drives as you wish. The device provides the power for the extra hard drives so as not to suck power from the DVR power supply. You need a line conditioner. Surge protectors do not do anything to clean up the power except in exteme spikes. Surge protectors cannot clean noise, and they cannot do anything during brown out situations. I urge a line conditioner. UPS may not have line conditioner. The more basic, the less likely that it has a conditioner. Share this post Link to post Share on other sites
rimist 0 Posted June 2, 2009 Here are the results of the voltage checks The transformer is getting 121.8vac from the wall, and putting out 19.13vdc The hdd connector is showing 12.07vdc and 4.92vdc when connected to the main board and the front power indicator is green. The fan connector is showing 12.07vdc when connected to the main board and the front power indicator is green. The following columns are pin#, vdc when not connected to the main board, vdc when connected to the main board: p01 3.33 -1.19 p02 3.33 -1.19 p03 3.33 -1.19 p04 0.01 4.53 p05 0.01 4.53 p06 0.01 -1.20 p07 0.01 -1.20 p08 0.01 -1.20 p09 4.91 0.39 p10 4.91 0.39 p11 -0.01 -4.53 p12 -0.01 -4.53 p13 -0.01 -4.53 p14 -0.01 0.34 p15 ground Share this post Link to post Share on other sites
juanelodi 0 Posted July 19, 2010 I have the same problem with an AVTECH 760M V06A mainboard dated 2006/12/20 and a 760P V05A daughterboard dated 2006/11/15. I changed three hard drives, and all are damaged, which could be the problem? Share this post Link to post Share on other sites
sparcmx 0 Posted June 17, 2013 Here are the results of the voltage checks The transformer is getting 121.8vac from the wall, and putting out 19.13vdc The hdd connector is showing 12.07vdc and 4.92vdc when connected to the main board and the front power indicator is green. The fan connector is showing 12.07vdc when connected to the main board and the front power indicator is green. The following columns are pin#, vdc when not connected to the main board, vdc when connected to the main board: p01 3.33 -1.19 p02 3.33 -1.19 p03 3.33 -1.19 p04 0.01 4.53 p05 0.01 4.53 p06 0.01 -1.20 p07 0.01 -1.20 p08 0.01 -1.20 p09 4.91 0.39 p10 4.91 0.39 p11 -0.01 -4.53 p12 -0.01 -4.53 p13 -0.01 -4.53 p14 -0.01 0.34 p15 ground I know this thread is old, but hey, I found it and it got me started, so here's the rest. You can use a pc ATX psu, using the 24pin motherboard connector, cut the green wire and a black earth wire and connect those to jump start the psu (don't run it without a device attached, high resistance will cook it in minutes). Red wires are 5v, connect to pin 9 and 10 Orange wires are 3.3v, connect to pins 1,2,3,6,7,8 Obviously use one of the hdd connectors for the drive. Now time to find a place to put the Dvr with a dirty big psu lumped on top, good times. Share this post Link to post Share on other sites
